Whois: a tool for retrieving the information about domains and IP addresses from the whois databases.

Traceroute: Traceroute is designed for quick network route discovery. Unlike standard traceroute, it traces all the way to host at once, therefore saving tenth to hundreds times.

NScan: NScan is one of the most fast and flexible portscanners for Windows. It is specially designed for scanning large networks and gathering related network/host information. It supports remote monitoring, usage of host and port lists, option profiles, speed and accuracy tuning, etc. Includes whois, dig and traceroute. Shareware.